Lighting a custom specular pass for sparkle

…In addition to our ambient inclusion pass, sometimes a custom…specular pass pass really helps make a surface pop out.…What I'm going to do is make a custom specular pass, and I'll put it just…on the left side tile wall, so I get a little extra sparkle on that tile.…Here's how I'll make this work.…I'll go into a perspective and select all the objects in my scene.…There is no lights on this layer, so I'm just catching the geometry.…And I'll make them a new render layer, adding the selected objects.…I'll name this new render layer, spec.…

And this is short for specularity.…I'll turn off the ambient occlusion render layer.…And assign all the objects on this new render layer a new material.…I'll put on a surface shader.…Now, with this new surface shader…on, I'm going to name it spec black.…And I'll get a custom material ready for just that tile.…I'll zoom in and select the tile wall.…With a tile wall selected I'll assign a new material.…And this new material will be a blimp.…

In this blimp I'm going to black out the color and use the same…